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kernel: fix corrupted ethernet header on bridge multicast-to-unicast

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Fixes: 45a8e962a5 ("kernel: fix crash with multicast-to-unicast and fraglist GRO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2024-05-05 20:48:23 +02:00
parent 49a64c9541
commit ccb2390d4f
2 changed files with 84 additions and 0 deletions
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42
target/linux/generic/pending-6.1/684-net-bridge-fix-corrupted-ethernet-header-on-multicas.patch Normal file
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@ -0,0 +1,42 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 5 May 2024 20:36:56 +0200
Subject: [PATCH] net: bridge: fix corrupted ethernet header on
multicast-to-unicast
The change from skb_copy to pskb_copy unfortunately changed the data
copying to omit the ethernet header, since it was pulled before reaching
this point. Fix this by calling __skb_push/pull around pskb_copy.
Fixes: 59c878cbcdd8 ("net: bridge: fix multicast-to-unicast with fraglist GSO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -253,6 +253,7 @@ static void maybe_deliver_addr(struct ne
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
const unsigned char *src = eth_hdr(skb)->h_source;
+ struct sk_buff *nskb;
if (!should_deliver(p, skb))
return;
@@ -261,12 +262,16 @@ static void maybe_deliver_addr(struct ne
if (skb->dev == p->dev && ether_addr_equal(src, addr))
return;
- skb = pskb_copy(skb, GFP_ATOMIC);
- if (!skb) {
+ __skb_push(skb, ETH_HLEN);
+ nskb = pskb_copy(skb, GFP_ATOMIC);
+ __skb_pull(skb, ETH_HLEN);
+ if (!nskb) {
DEV_STATS_INC(dev, tx_dropped);
return;
}
+ skb = nskb;
+ __skb_pull(skb, ETH_HLEN);
if (!is_broadcast_ether_addr(addr))
memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);

42
target/linux/generic/pending-6.6/684-net-bridge-fix-corrupted-ethernet-header-on-multicas.patch Normal file
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@ -0,0 +1,42 @@
From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 5 May 2024 20:36:56 +0200
Subject: [PATCH] net: bridge: fix corrupted ethernet header on
multicast-to-unicast
The change from skb_copy to pskb_copy unfortunately changed the data
copying to omit the ethernet header, since it was pulled before reaching
this point. Fix this by calling __skb_push/pull around pskb_copy.
Fixes: 59c878cbcdd8 ("net: bridge: fix multicast-to-unicast with fraglist GSO")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -258,6 +258,7 @@ static void maybe_deliver_addr(struct ne
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
const unsigned char *src = eth_hdr(skb)->h_source;
+ struct sk_buff *nskb;
if (!should_deliver(p, skb))
return;
@@ -266,12 +267,16 @@ static void maybe_deliver_addr(struct ne
if (skb->dev == p->dev && ether_addr_equal(src, addr))
return;
- skb = pskb_copy(skb, GFP_ATOMIC);
- if (!skb) {
+ __skb_push(skb, ETH_HLEN);
+ nskb = pskb_copy(skb, GFP_ATOMIC);
+ __skb_pull(skb, ETH_HLEN);
+ if (!nskb) {
DEV_STATS_INC(dev, tx_dropped);
return;
}
+ skb = nskb;
+ __skb_pull(skb, ETH_HLEN);
if (!is_broadcast_ether_addr(addr))
memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);